Pre-stressed anchor cable construction method

A kind of technology of prestressed anchor cable and construction method

Active Publication Date: 2013-05-08
BEIJING MUNICIPAL ROAD & BRIDGE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the weak soil layer with poor self-stability such as silt and fine yarn, it is difficult to ensure the quality of the hole and obtain the ideal pull-out force if the ordinary anchor cable construction method is used.

Method used

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  • Pre-stressed anchor cable construction method

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Embodiment Construction

[0009] The prestressed anchor cable construction method of the present invention will be described below in conjunction with the accompanying drawings and specific examples.

[0010] In this example, the main geological conditions of the construction area are clay, silty clay, silt, silt fine sand, partly mixed with silt, rich groundwater, which belongs to water-rich and weak stratum. For this kind of stratum, it is difficult to ensure the quality of the hole and obtain the ideal pullout force by using the conventional anchor cable construction method.

[0011] On the basis of the traditional prestressed anchor cable construction method, the inventor of the present invention uses a sleeve to protect the anchor cable hole. During the hole forming process, the sleeve follows up. After the grouting and the anchor cable are lowered, the sleeve is pulled out , which can effectively prevent the anchor cable hole from collapsing and ensure the effective diameter and length of the anc...

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Abstract

The invention provides a pre-stressed anchor cable construction method which comprises the following steps that: a hole is drilled under protection of a sleeve and the sleeve support fragile strata at the periphery of the anchor cable hole; after the hole is formed, a first ordinary pressure pouring is conducted so that the sleeve is prevented form sliding in the process that an anchor cable is placed downwards and the anchor cable can be fixed rapidly after being installed; after installation of the anchor cable, the sleeve is removed and compensatory pouring is conducted; and when the intensity of a pouring body formed in the first ordinary pressure pouring reaches a required value, secondarily separating high pressure pouring is conducted so that the anchor cable can be anchored firmly. The pre-stressed anchor cable construction method effectively compensates shortages of ordinary pre-stressed anchoring construction technology, greatly improves pre-stressed anchor cable support effect for the fragile stratum side slopes containing rich ground water, improves project construction speed and increases safety factors of the side slopes.

Description

technical field [0001] The invention relates to a prestressed anchor cable construction method, in particular to a prestressed anchor cable construction method used in water-rich and weak formations with poor self-stabilization ability such as silty clay and silty sand layers in the technical field of foundation pit slope support. Anchor cable construction method. Background technique [0002] In recent years, with the rapid development of my country's infrastructure construction, more and more slope projects will be involved in projects such as expressways, industrial and civil buildings, urban rail transit, large public facilities, and stadiums. Maintenance has become an important and difficult point of project quality and safety. In the deep foundation pit slope support engineering, the support form of pile plus prestressed anchor cable or composite soil nail wall with prestressed anchor cable is often used. In the construction of general prestressed anchor cables, ordin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02D5/74
Inventor 李凌宜杨玉杰蔡玮刘长剑刁文超周世生叶锦华李艳涛孙景凤
Owner BEIJING MUNICIPAL ROAD & BRIDGE
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